I think you made the right decision. I would not have subjected him to eye surgery especially at that age. It probably wouldn't have changed things anyway.
I asked my vet about Buffy, should I remove the tumor?! He said we can't, it would mean basically removing the tongue. Then I asked about radiation. He said its an aggressive cancer and nothing would help. I agreed, I guess I just wanted confirmation. Better they live their last days in peace.
You've done that for yours. They had a good life. That's all anyone can ask for. Again I'm sorry for your losses. (((Hugs)))